1025509987 has 2 divisors, whose sum is σ = 1025509988. Its totient is φ = 1025509986.

The previous prime is 1025509951. The next prime is 1025510011. The reversal of 1025509987 is 7899055201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1025509987 - 2¹⁹ = 1024985699 is a prime.

It is not a weakly prime, because it can be changed into another prime (1025509907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512754993 + 512754994.

It is an arithmetic number, because the mean of its divisors is an integer number (512754994).

Almost surely, 2^1025509987 is an apocalyptic number.

1025509987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1025509987 is an equidigital number, since it uses as much as digits as its factorization.

1025509987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 46.

The square root of 1025509987 is about 32023.5848555405. The cubic root of 1025509987 is about 1008.4320300329.

The spelling of 1025509987 in words is "one billion, twenty-five million, five hundred nine thousand, nine hundred eighty-seven".